import React from 'react';
import ReactDOM from 'react-dom';
import './index.css';
function Square(props) {
    return (
        // eslint-disable-next-line react/no-direct-mutation-state
        <button
            className="square"
            onClick={ props.onClick }
        >
            { props.value }
        </button>
    );
}
//
// class Square extends React.Component {
//     render() {
//
//   }
// }

class Board extends React.Component {
    constructor(props) {
        super(props);
        this.state = {
            squares : Array(9).fill(null),
            xIsNext: true
        }
    }

    handleClick(i){
        const squares = this.state.squares.slice();
        if (calculateWinner(squares) || squares[i]){
            return
        }
        squares[i] = this.state.xIsNext ? "X" : "O";
        this.setState({squares:squares, xIsNext: !this.state.xIsNext})
    }

    renderSquare(i) {
        return <Square
            value={this.state.squares[i]}
            onClick={()=>this.handleClick(i)}
        />;
    }

  render() {
      const winner = calculateWinner(this.state.squares);
      let status;
      if (winner) {
          status = 'Winner: ' + winner;
      } else {
          status = 'Next player: ' + (this.state.xIsNext ? 'X' : 'O');
      }


    return (
      <div>
        <div className="status">{status}</div>
        <div className="board-row">
          {this.renderSquare(0)}
          {this.renderSquare(1)}
          {this.renderSquare(2)}
        </div>
        <div className="board-row">
          {this.renderSquare(3)}
          {this.renderSquare(4)}
          {this.renderSquare(5)}
        </div>
        <div className="board-row">
          {this.renderSquare(6)}
          {this.renderSquare(7)}
          {this.renderSquare(8)}
        </div>
      </div>
    );
  }
}

class Game extends React.Component {
  render() {
    return (
      <div className="game">
        <div className="game-board">
          <Board />
        </div>
        <div className="game-info">
          <div>{/* status */}</div>
          <ol>{/* TODO */}</ol>
        </div>
      </div>
    );
  }
}

// ========================================

ReactDOM.render(
  <Game />,
  document.getElementById('root')
);

function calculateWinner(squares) {
    const lines = [
        [0, 1, 2],
        [3, 4, 5],
        [6, 7, 8],
        [0, 3, 6],
        [1, 4, 7],
        [2, 5, 8],
        [0, 4, 8],
        [2, 4, 6],
    ];
    for (let i = 0; i < lines.length; i++) {
        const [a, b, c] = lines[i];
        if (squares[a] && squares[a] === squares[b] && squares[a] === squares[c]) {
            return squares[a];
        }
    }
    return null;
}